<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>01测试</title>
    <link rel="stylesheet" href="../css/index.css">
</head>
<body>
    <div id="app">
        测试
        <script>
            // document.write("<h1>输出<h1>")
        </script>
    </div>
</body>
</html>
<script>
    // alert("测试弹框")
    console.log("控制台信息")
    console.log("output more");
    document.getElementById("app").style.color ="green"
</script>